You don't need a tune for a off road mid pipe. The only reason you tune with a off road is to shut off the CEL. As far as it voiding the warranty.....not sure. I'm sure you could throw the stock mid pipe back on when you take it in and play dumb.

You don't need a tune for a off road mid pipe. The only reason you tune with a off road is to shut off the CEL. As far as it voiding the warranty.....not sure. I'm sure you could throw the stock mid pipe back on when you take it in and play dumb.

Could have sworn more than one person has said the fact the 02 sensors are still on, since a tune doesn't shut off the CEL it shuts off the 02 sensors will cause the car to not run as well. I forgot which it either runs way to lean or way to rich because of the rear 02 sensors still being on.

By taking off the cats and not tuning the car after putting the magnaflow off road x on, will my warranty be voided since the ECU won't be touched

It might just be my dealership but but I asked the shop foreman at my local dealership about exhaust and he said to go crazy on everything after the cats. Then again it might just be my dealership but that sounds about right. No cats is illegal which must void warranty.

You absolutely do need a tune to run an off road mid pipe. There's more to it than just shutting off the rear o2's. You also have to have the COT feature shut off. And yes it will void your power train warranty.